Evidence Shows Global Warming Signals May Have Been Measured Slightly Earlier than Some Previously Thought

Meteorology Matters discusses a study indicating that human influence on global climate, specifically stratospheric cooling, could have been detected as early as 1885, preceding the widespread use of automobiles. Researchers conducted an experiment using modern climate models and hypothetical 1860 measurement capabilities to identify this early "human fingerprint" on atmospheric temperatures. The study highlights that stratospheric cooling is a strong indicator due to its clear response to CO2 increases and minimal natural variability, making detection easier than with surface temperatures. The authors of the study emphasize the importance of continued observation of the upper atmosphere for monitoring climate change, especially given current budget cuts impacting climate research.